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LOANS AND ALLOWANCE FOR LOAN LOSSES - Troubled Debt Restructuring (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) contract | Mar. 31, 2018 USD ($) contract | Dec. 31, 2018 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |
Total | $ 1,158 |  | $ 1,196
Specific reserves on TDRs | $ 0 |  | $ 0
Troubled Debt Restructurings: |  |  |
Number of Contracts | contract | 0 | 2 | 4
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 93 | $ 582
Post-Modification Outstanding Recorded Investment | $ 0 | $ 93 | $ 582
Commercial and industrial |  |  |
Troubled Debt Restructurings: |  |  |
Number of Contracts | contract |  | 1 | 3
Pre-Modification Outstanding Recorded Investment |  | $ 15 | $ 504
Post-Modification Outstanding Recorded Investment |  | $ 15 | $ 504
1-4 family residential |  |  |
Troubled Debt Restructurings: |  |  |
Number of Contracts | contract | 0 | 1 | 1
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 78 | $ 78
Post-Modification Outstanding Recorded Investment | $ 0 | $ 78 | 78
Farmland |  |  |
Troubled Debt Restructurings: |  |  |
Number of Contracts | contract | 0 |  |
Pre-Modification Outstanding Recorded Investment | $ 0 |  |
Post-Modification Outstanding Recorded Investment | 0 |  |
Nonaccrual TDRs |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Total | 487 |  | 335
Performing TDRs |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Total | $ 671 |  | $ 861

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